LA4905 Datasheet, PDF (1/10 Pages) Sanyo Semicon Device – 17-W, 2-Channel BTL AF High-Efficiency Power Amplifier for Car Stereo Systems

Ordering number : EN5504
Monolithic Linear IC
LA4905
17-W, 2-Channel BTL AF High-Efficiency
Power Amplifier for Car Stereo Systems
Overview
The LA4905 is a BTL 2-channel power amplifier IC for
use in car audio systems. Increases in the number of
external components are held to a minimum by adopting
both a signal-following type switching scheme in the
amplifier’s output stage power supply, and a newly-
developed nonlinear amplifier that has nonlinear
characteristics in the signal system. The power dissipation
(thermal loss) in the actual operating range has been
reduced to about 1/2 that of earlier class B amplifier ICs.
This contributes significantly to miniaturization of the heat
sink and to reduction of heating within the set.
Features
• Power dissipation reduced by 50% (When average
music power is measured, and when compared to earlier
Sanyo products.)
• The number of required signal follower circuits has been
reduced to a single circuit for two channels, allowing the
number of external components to be reduced.
• The output is a pure analog signal: no switching noise is
output to the output lines.
• Operates on an 8 to 18-V single-voltage power supply.
• Full complement of built-in protection circuits (shorting
to the power supply, shorting to ground, overvoltage,
and thermal protection)
• Built-in standby switch
Package Dimensions
unit: mm
3160-SIP23HZ
[LC4905]
SANYO: SIP23HZ
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Maximum supply voltage
Maximum output current
Allowable power dissipation
V_CC max1
V_CC max2
I_O Peak
Pd max
No input, t = 1 minute
(Per channel)
With an arbitrarily large heat sink
Operating temperature
Topr
Storage temperature
Tstg
Notes: 1. Set VCC and RL in the range where Pd max does not exceed 37.5 W.
2. The overvoltage protection circuit operates when VCC is 20 V or higher.
Ratings
Unit
24
V
18
V
4.5
A
37.5
W
–35 to +85
°C
–40 to +150
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83096HA (OT) No. 5504-1/10